任意形状港湾における3次元湾水振動解析に関する二、三の考察

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Recently, many studies on long-period waves and long-period moored ship motions have been done around the world. Also the problems on excessive motions of moored ships induced by the long-period waves in harbor basins have been revealed in many harbors. It is well-known that the problems are caused by a resonance of both the natural period of surge and the waves. There are several numerical simulation methods on harbor oscillations such as Lee's method and Ijima's method. The Lee's method is an effective and high accuracy boundary element method in practical use. However this method assumes the water depth as constant at the whole analytical region because the method let the 3-dimensional problem arrive at 2-dimensional one. In the actual harbor basin, the water depth is variable at some harbor regions such as sea routes and ship turning basins. Then in order to evaluate the harbor oscillations seriously, the method makes some troubles due to the assumption on water depth as constant. On the other hand, the Ijima's method is a 3-dimensional boundary element method which uses a Green function of Laplace equation, G=1/r. Then this method can calculate and evaluate the harbor oscillations at an arbitrary topography of harbor. In this study, by using the Ijima's method, we have conducted numerical simulations on harbor oscillations for model harbors which have variable water depths. Then in processing of making the program of Ijima's method, we find out some topics on a convergence of integral on each element and a singularity integral on each element (i=j) by an approximate integral method and analytical one. And it is found that the pattern of harbor oscillations is influenced by variable water depth.
2003-03-25

任意形状港湾における3次元湾水振動解析に関する二、三の考察

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